The density of superconductivity in the bulk regime Bernard HelfferAyman Kachmar Indiana University Mathematics Journal 2018 text pdf 10.1512/iumj.2018.67.7511 10.1512/iumj.2018.67.7511 en Indiana Univ. Math. J. 67 (2018) 2181 - 2198 state-of-the-art mathematics http://iumj.org/access/